Half-Life recently received a big update to celebrate its 25th birthday, but a significant bug remained. In a famous scripted sequence during which a long, green tentacle busts through a window and drags away a scientist, the scientist and the tentacle would be mis-aligned, making it look like the scientist floated out of the window of his own volition.

Not anymore. After over twenty years, Valve programmer Ben Burbank has fixed the bug - and explained how he did it.

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